There are 17 Wallpaper Groups: Type of Symmetry: p1, p2, pm, pg, cm, pmm, pmg, pgg, cmm, p4, p4m, p4g, p3, p3m1, p31m, p6, p6m – Key to Nomenclature: p = primitive cell; c = centered cell; m = mirror reflection; g = glide reflection; 1 = no rotation; 2 = 180 degree rotation; 3 = 120 degree rotation; 4 = 90 degree rotation; 6 = 60 degree rotation. Tesselation tile structure at La Alhambra palace, 14th century. Image: alhambra_9.jpgmath.ucr.edu

la alhambra